Earpiece for thermic telephones



PIETER DE LANGE AND ROBERT AERNOUT BARON VAN LYNDEN. EARPIECE FOR THERMIC TELEPHONES. APPLICATION FILED NOV. 4, 1915.

1,366,567, Patented Jan. 25, 1921.

UNITED STATES PATENT orrlciz.

PIETEB DE LANGE AND ROBERT AERNOUI BAR/0N VAN LYNDEN, OF U'IRECHT,

NETHERLANDS, ASSIGNORS, BY MESNE ASSIGNMENTS, T0 AMERICAN OF MASSACHUSETTS.

EARPIECE FOR THEE/MIC TELEPI-IONES.

Specification of Letters Patent.

Patented Jan. 25, 1921.

Application filed November 4, 1915. Serial No. 59,625.

To all whom it may concern Be it known that we, Pni'rnn on Lance and Ronnnr AERNOUT BARON VAN LYNnnN, both subjects of the Queen of the Netherlands, and residing at Utrecht, in the Netherlands, have invented new and useful Ear-Pieces for Thermic Telephones, of which the following is a specification.

Uur invention. relates to thermic telephones having oliveor uipple-shaped sound receivers designed to he introduced into the auditory passage of the human ear. The use of such receivers is sometimes objected to by sensitive persons as the receiver is liable to be contaminated by secretions of the ear. The novel invention provides means for enabling this type of thermic telephone which possess great advantages on account of their smallness and lightness to be used without hesitation 'even by the most tastidious persons.

l/Vith this object in view, we provide the receiver of the telephone with an ear piece adapted to be placed against the outer ear.

Reference is to be had to the accompanying drawings in which we have illustrated an embodiment oi our invention, by way of example. Figure 1 represents partly in section, a thermic telephone having an oliveor nipple-shaped sound. transmitter, the ear piece above referred to being indicated in dotted lines; Fig. 2 is a vertical section of the ear piece detached from the telephone.

The thermic telephone illustrated in Fig. 1 is of the usual type, consisting of a suitable casing 1 for the heating conductors 2 which are indicated in dotted lines, a cylin' clrical portion 3 and an oliveor nippleshaped head 4.. 5 is a sound opening in the head of the telephone. Current is supplied to the telephone by any suitable means, such as a cord 6. The user may introduce this telephone directly into his ear or attach to it the sliding ear piece 7. This latter as illustrated in Fig. 2, has a resilient bush or sleeve 8, with slots 9 at its free end. It fits exactly over the cylindrical portion 3 of the telephone casing and effectually prevents the escape of sound waves at that part. When the ear piece 7 is placed against the outer ear, the sound waves pass from the opening 5 into the ear just as Well as if the receiver were introduced into the auditory passage.

The slitted end of the sleeve 8 is adapted to engage a bead 3 0n the telephone, as shown in Fig. 1, said bead forming a stop to limit the sliding movement of the earpiece on the telephone, and to prevent the head at from being introduced into the auditory passage.

The construction and arrangement of the parts described may be modified in various ways without departing from the spirit of this invention.

We claim:

1. An ear-piece for telephones, compris ing a cylindrical sleeve rigid at one end and slitted at the other end to give it elasticity, and enable it to he slipped on and oil a telephone receiver, the inner diameter of said sleeve being just SLlillClGlli} to receive a thermic telephone adapted for insertion into the auditory passage, and an annular cupshaped member attached to said sleeve at its rigid end and extending from such end outwardly and in a direction away from said resilient end.

2. An ear-piece for thermic telephones, comprising a sleeve adapted to be fitted to slide on a thermic telephone of an external diameter adapting such telephone for introduction into the auditory passage of the human ear, said sleeve having an internal diameter corresponding substantially to that of such auditory passage, and an annular Y cupshaped member extending from one end of such sleeve outwardly and in a direction away from the other end. 7

3. A thermic telephone of a size adapted for insertion into the auditory passage of the human ear, said telephone being pro vided with an external bead or stop at a dis tance from its free end, and an ear-piece comprising a sleeve adapted to be slipped over said end of the telephone and against said stop, and provided at one end with an annular cup-shaped member extending outwardly and away from the other end of the sleeve.

In testimony whereof We have signed this specification.

PIETER cle LANCE. ROBERT AERNOUT BARON van LYNDEN. 

